Email is inherently insecure. If you want or need secure communications, that’s what software like Briar, Matrix, or Signal (yes despite some drama).
Secure emails can always be done manually with PGP and will be a lot hardier than trusting an organization that gives away subscriber payments to Western-backed coup attempts and color revolutions.
In principle, email is helpful for three things:
When I got started using email, as long as I had those three things, I was absolutely indifferent to what platform was used.
Email maintains its convention because everyone has an email address, or anyone can make one. I am pretty sure that minors can’t obtain a cell phone. They could get an email address and then sign up for a voip before they could go to the local cellphone provider and get one.
I have tried Briar, it is too combersome a platform - but it is very powerful. Matrix is legit and massively under-rated. And signal remains the smoothest way to introduce people to encrypted communication.
As security and privacy have become more relevant to me, I have been exceptionally intrigued how developers intend to use DERO.io, aside from it being P2P financial network and smart contract platform, as a messaging and email client.